TRICHINA SPIRALIS. 343 



3. "At the second day after their introduction, the intestinal 

 Trichina attain their full sexual maturity." 



4. " The eggs of the female Trichinae are developed within the 

 uterus of the mother, into minute filaria-Kke embryos which, from 

 the sixth day, are born without their egg-shells." 



5. " The new-born young soon after commence their wander- 

 ing. They penetrate the walls of the intestine and pass directly 

 through the abdominal cavity into the muscles of their bearers, 

 where, if the conditions are otherwise favourable, they are developed 

 into the form hitherto known." 



6. " The directions in which they proceed are in the course of 

 the intermuscular connective tissues." 



7. " The majority of the wandering embryos remain in those 

 sheathed muscular groups which are nearest to the cavity of the 

 body (abdomen and thorax), especially in those which are smaller 

 and most supplied with connective tissue." 



8. " The embryos penetrate into the interior of the sepa- 

 rate muscular bundles, and here, already, after fourteen days, 

 acquire the size and organization of the well-known Trichina 

 spiralis." 



9. " Soon after the intrusion of the parasite, the infested 

 muscular fibre loses its original structure. The fibrillse collapse 

 into a finely granular substance, whilst the muscular corpuscles 

 change into oval nucleated cells." 



10. " The infected muscular bundle retains its original sheathing 

 up to the time of the complete development of the young Trichina, 

 but afterwards its sarcolemma thickens and begins to shrivel at 

 the extremities." 



11. " The spot inhabited by the roUed-up parasites is converted 

 into a spindle-shaped widening, and within this space, under the 

 thickened sarcolemma, the formation of the well-known lemon- 

 shaped or globular cysts commences by a peripheric hardening 

 and calcification." 



12. " The migration and development of the embryos also 



