99 
Table (continued). 
Date. Name of Animal. Size of Tubes. State of Testes, &c. 
1000th of an inch in 
diameter ; great abun- 
dance of molecules; no 
perfect spermatozoa. 
May _3.|Fringilla domestica, Linn. ......| 1-80 to 1-66 |Testis one-third of an 
inch iong and one- 
fourth broad ; sperma- 
tozoa plentiful ; mole- 
cules not abundant. 
Feb. 28.|Fringilla Coelebs, Linn. ......... 1-90 to 1-71 |Testis one-tenth of an 
inch in diameter ; nu- 
merous cells contain- 
ing rudimentary sper- 
matozoa, but none per- 
fect; molecules very 
numerous. 
May 4./Emberiza Citrinella, Linn.......| 1-80 to J-60 |Testis one-third of an 
3 inch long and one- 
fourth broad, contain- 
ing a little yellow pig- 
ment; spermatozoa 
very numerous; mole- 
cules not abundant. 
May 22./Cuculus canorus, Linn. .,.......| 1-100 to 1-66 |Testis one-fifth of an inch 
in diameter, of an in- 
tense yellow colour; 
numerous _ staff-like 
bodies in semen 1- 
2666th of an inch long 
and 1-25,000th broad. 
Died in confinement. 
Nov. 26.|Picus minor, Linn. ...........+++.|1-571 to 1-363/Testis size of a rape- 
seed; no spermatozoa 
or molecules. 
May 31./Cypselus Apus, Flem. ..........+ 1-150 to 1-100)Testis one-third of an 
inch long and one-fifth 
broad; spermatozoa 
numerous; molecules 
scanty. 
Dec. 5./Columba Livia, Briss. ......... 1-444 to 1-285/Testis about as big as a 
hemp-seed ; no sper- 
matozoa ; a few mole- 
cules. 
May 12.|Sterna Hirundo, Linn. ......... 1-240 to 1-200|Testis one-tenth of an 
inch in diameter; no 
spermatozoa; mole- 
cules plentiful. 
Molecules of the Semen.—The molecules mentioned in the prece- 
ding table are minute, smooth, circular particles, much resembling, 
both in chemical and physical characters, the “minute oil-like 
spherules” which I have depicted in the juice of the supra-renal 
bodies (Appendix to Gerber’s Anatomy, p.103). The “ minute shi- 
ning globules and smaller molecules,’ described by Professor R. 
