Satapatha Brahmana Part IV (SBE43), Julius Eggeling tr. [1897], at sacred-texts.com
10:2:1:11. Pragâpati was desirous of going up to the world of heaven; but Pragâpati, indeed, is all the (sacrificial) animals 3--man, horse, bull, ram, and
he-goat:--by means of these forms he could not do so. He saw this bird-like body, the fire-altar, and constructed it. He attempted to fly up, without contracting and expanding (the wings), but could not do so. By contracting and expanding (the wings) he did fly up: whence even to this day birds can only fly up when they contract their wings and spread their feathers.
10:2:1:22. He measures it (the fire-altar) by finger-breadths; for the sacrifice being a man 1, it is by means of him that everything is measured here. Now these, to wit, the fingers, are his lowest measure: he thus secures for him (the sacrificial man 2) that lowest measure of his, and therewith he thus measures him.
10:2:1:33. He measures by twenty-four finger-breadths 3,--the Gâyatrî (verse) consists of twenty-four syllables, and Agni is of Gâyatra nature 4: as great as Agni is, as great as is his measure, by so much he thus measures him.
10:2:1:44. He contracts 5 (the right wing) inside on both
sides 1 by just four finger-breadths, and expands 2 it outside on both sides 1 by four finger-breadths: he thus expands it by just as much as he contracts it; and thus, indeed, he neither exceeds (its proper size) nor does he make it too small. In the same way in regard to the tail, and in the same way in regard to the left wing.
10:2:1:55. He then makes two bending-limbs 3 in the wings, for there are two bending-limbs in a bird's
wings. In one-third (of each wing he makes them), for the bending-limbs are in one-third of the bird's wings;--in the inner third 1, for the bending-limbs are in the inner third of a bird's wings. He expands (each of these limbs) in front 2 by just four finger-breadths, and contracts it behind by four finger-breadths; he thus expands it by just as much as he contracts it; and thus, indeed, he neither exceeds (its size), nor does he make it too small.
10:2:1:66. On that bending-limb he places one brick he thereby gives to it that single tube (tubular organ) which joins on to 3 (the body) from the bending-limb of the flying bird. Then here (on the left wing).
10:2:1:77. He then makes the wings crooked, for a bird's wings are crooked; he expands them behind by just four finger-breadths, and contracts them in front by four finger-breadths 4: he thus draws them out by
just as much as he draws them in; and thus, indeed, he neither exceeds (its size) nor does he make it too small.
10:2:1:88. He now gives to it (the altar) the highest form 1. This Agni had now been completely restored, and the gods conferred upon him this highest form; and in like manner does this (Sacrificer) confer upon him this highest form: he makes a thousand bricks marked with straight lines, a thousand marked this way (from left to right), and a thousand marked that way (from right to left).
10:2:1:99. And when he has laid down the fifth layer, he measures out the altar in three parts, and on the central part he places the one thousand bricks marked with straight lines: he thereby gives to it those straight plumes of the bird pointing backwards (with their tops, and covering it) from head to tail.
10:2:1:1010. On the right side he then lays down the one thousand (bricks) marked thus (from left to right): he thereby gives to it those curved plumes on the right side of the bird 2.
10:2:1:1111. On the left side he then lays down the one thousand (bricks) marked thus (from right to left): he thereby gives to it those curved plumes on the left side of the bird. With a thousand (bricks he does it each time)--a thousand means everything:
with everything (required) he thus confers that highest form upon him (Agni);--with three thousand--Agni is threefold: as great as Agni is, as great as is his measure, with so much he thus confers the highest form upon him.
299:3 See VI, 2, 1, 15 seq.
300:1 The sacrifice, being the substitute of (the sacrificing) man, is represented as identical with the Sacrificer, its measurements being taken from his body and stature; see part i, p. 78. note 1.
300:2 Or,--for it, viz. the fire-altar, representing both Agni-Pragâpati and the Sacrificer: hence this assumed identity has to be borne in mind to understand the symbolic speculations of the Brâhmana.
300:3 This measure (24 aṅguli) is equal to one 'aratni' or cubit; 12 aṅguli being equal to a 'vitasti' or span (of thumb and little finger, or from wrist to tip of middle finger).
300:4 See VI, 1, 1, 15; 1, 3, 29.
300:5 Or, he draws in, draws together (upasamûhati).
301:1 That is, on both sides of that part of the wing which joins the body of the altar he draws in by four finger-breadths the two long sides of the wing, thus changing the parallelogram into a trapezium, without altering the superficial area of the wing. On the plan of the altar given in part ii, p. 419, the effect of this manipulation on the wings and tail is indicated by pointed lines.--Sâyana remarks,--ubhayatah pakshasya pârsvadvaye, antaratah kityâgner madhyadese katuraṅgulam upasamûhati samkarshati pravesayatîty arthah; bâhyatah agnimadhyâd bâhyadese katuraṅgulam vyudûhati, ante vivardhayati.
301:2 Or, he draws out, or draws asunder (vyudûhati).
301:3 Literally 'outbendings' (nirnâma)--'Schwunggelenke' (spring-limbs), St. Petersb. Dict.--This 'bending-limb' would seem to include the two inner segments of the (solid part of the) wing--those corresponding to the upper and fore-arm of man--as well as the adjoining and connecting joints or articulations, which portions may be taken roughly as forming the inner third of the wing when covered with feathers. The 'bending-limb' would thus derive its name from its 'bending,' or drawing, the wing 'out' from the body. Sâyana, however, explains it by 'nitarâm namati,' 'that which bends down,' as if it were formed from the prep. 'ni,' instead of 'nis.' The manipulation to which this part of the wing is to be subjected is, however, not quite easy to understand from the description, and the commentary affords very little assistance--vitritîya iti pakshabhâgam tredhâ vibhagya antare tritîyabhâge nirnâmakaranam . .; etâm srutim apekshyaivâpastambenoktam, ‘vakrapaksho vyastapukkho bhavati, paskât prâṅ (!) udûhati, purastât pratyudûhati, evam eva hi vayasâm madhye pakshanirnâmo bhavatîti vigñâyate’ iti.
302:1 That is, the third part of the wing adjoining the body.
302:2 That is, at the front edge of the wing of the flying bird, that which cuts through the air. The joint between the second and third segments of the wing, when expanded, would protrude, whilst on the opposite side of the wing the tops of the feathers would somewhat recede; but I am not sure whether this is what is referred to in these indications.
302:3 Literally, which lies beside, or close to (upasete, viz. the body, as it would seem) from the bending-limb. The brick is apparently meant to represent symbolically the bone of the upper segment, or some tubular organ by which the vital air is supposed to enter the wing from the body. Sâyana remarks,--pakshipakshamadhyagatanâdîtvena prasamsati, . . kityâgneh pakshamadhye ekâm nâdîm eva nihitavân bhavati.
302:4 Comm.--katuraṅgulamâtram paskâdbhâge udûhati vikarshati, purastâdbhâge katuraṅgulamâtram samûhati samkarshati; evam krite vakratvam bhavati. Cf. Âpastamba's directions in note 3 of last page. I fail to see, however, in what respect this manipulation differs from that referred to in paragraph 5; and whether the p. 303 'vakratvam' refers to the irregular shape, or to the curved nature, of the wings.
303:1 That is, he gives to it the last finish.
303:2 Or, perhaps, those soft feathers of the bird curved towards the right. Sâyana as above--dakshinatah dakshinapakshe ityâlikhitâ dakshinâvrita ishtakâh; uttaratah uttarasmin pakshe ityâlikhitâh savyâvrita ishtakâ upadadhyât.