92 THE PHYSIOLOGY OF REPRODUCTION 



THK CYCLE IN INSECTIV<>I;KS 



The changes which occur in the internal generative organs 

 during the cycle iu Tufniin jin-nnim, and in the aberrant Insectivore. 

 <!iil,-nj>itlii<-iis riihui*, have received sonic slight attention. 



Strat/ 1 has described the existence of -a. blood-clot and a 

 "menstrual" flow in Tu/Hiiu, and records the presence of de- 

 squamated epithelial cells in the blood-clot. Van Herwerden,- 

 however, slates that the individuals which Strat/ examined were 

 in the puerperal stage, and that, although Tn/mitt can experience 

 "heat" and become pregnant at this time, trustworthy conclusions 

 regarding the severity of the proo-strous changes cannot be drawn 

 from such specimens. That there was considerable bleeding van 

 Herwerden admits. Nothing i- s known about the periodicity of the 

 changes in Tn/mia. 



In Galeopithecua van Herwerden describes uterine hypera-mia 

 during the prou-strum. In the superficial mucosa numerous highly 

 congested capillaries were noticed. In the later stages blood was 

 found extravasated in the stroma, some of it being collected in 

 .-paces which were probably comparable to the sub-epithelial ha-mato- 

 mata described by Gebhard in the menstruating human female. In 

 tin- superficial epithelium spots were detected where a few of the 

 cells had been removed. lUeeding did not appear to be localised 

 to any particular area in the uterus. 



Van Herwerden is certain that the changes observed could not 

 be ascribed to a puerperal condition, as in the case of Tn/>nin, but 

 must have been the result of a normal pron-strum. The periodicity 

 of the changes is unknown. 



THE CYCLE IN CAI:MVOI;KS 



Tbe bistological changes in the non-pregnant uterus have been 



studied in the dog :! and in the ferret. 1 The periods into which the 

 uterine cycle is divided in the dog are as follows: 



( I) Period of i - Ano sti urn. 



(-1) Period of growth and congestion | j.,,,,,^,,.,,,,, 



(:}) Period of destruction -/ 



(1) Period of recuperation - - - <lv-tru>. 



Followed by farther growth and glandu- Followed li\ |>if^ii;i?icy \- |..SIMK|O- 

 l;ir development, tln-s<- changes l.t-inj: |)r<-j:ii;iiicv or. a< >oin.-t inic^ in tlic 



succeeded by degenerative t-haiiL" fei-ret. li\ metoestrum). 



1 Strat/, In,', ,-lt. 



- \ 'an llei werdfi), lo< . 



Maislial! and .lollv, " ContribatiottB to tin- Physiology of Mammalian 



I.Vpn (liirtion : I'ait I. The (Kst runs Cycle in tlie I )uj:, :: /'///. 7'/v///.s-., I',.. 

 vol. c.xcviii.. l!of>. Mai-hall am] Hainan. /: <-it. 



4 Marshall, vi 'l'lie <Kstrmi> ( 'yi-lc in the < 'oinnion I'eiM-t.' <J"ar. J,,,ir. Mi',-. 

 I. \h iii.. I'." i4. 



