SUMMARY OF CURRENT RESEARCHES 



EEIiATING TO 



ZOOLOGY AND BOTANY 



(PEINCIPALLY INVERTEBRATA AND CRYPTOGAMIA), 



MICBOSCOPY, Etc.* 



ZOOLOGY. 



VERTEBPvATA. 



d' Embryolog-y.t 



Cyclic Changes in Mammalian 0vary4 — Leo Loeb finds that 

 rabbit and ferret do not show cyclic changes in the follicular appa- 

 ratus of the ovaries, comparable to those he previously described in the 

 guinea-pig. The guinea-pig's ovary has no interstitial gland like that 

 of rabbit and ferret. In the guinea-pig during heat a spontaneous 

 ovulation occurs, not depending on preceding copulation. In rabbit 

 and ferret copulation is necessary, as well as heat, to ensure ovulation. 

 During the winter the ovaries of the ferret are small, but the interstitial 

 gland is well preserved. 



Cyclic Changes in Mammary Gland of Guinea-pig.§ — Cora 

 Hesselberg and Leo Loeb find that the normal sex-cycle of the guinea- 



* The Society are not intended to be denoted by the editorial" we," and they 

 do not hold themselves responsible for the views of the authors of the papers 

 noted, nor for any claim to novelty or otherwise made by them. The object of 

 this part of the Journal is to present a summary of the papers as actually pub- 

 lished, and to describe and illustrate Instruments, Apparatus, etc., which are 

 either new or have not been previously described in this country. 



t This section includes not only papers relating to Embryology properly so 

 called, but also those dealing with Evolution, Development, Reproduction, and 

 allied subjects. 



J Proc. Soc. Exper. Biol. Med., xiii. (1916) pp. 162-4. See Physiol. Abstracts, 

 i. (1916) No. 8, p. 365. 



§ Proc. Soc. Exper. Biol. Med., xiii. (1916), pp. 164-6. See Physiol. Abstracts, 

 i. (1916) No. 8, p. 365. 



2 G 2 



