74: 



Prof. E. Bay Lankester. On a Convenient [Feb. 20, 



The laws concerning chemical statics and dynamics in light are here 

 elicited in an experimental way and are of a formal nature. In a 

 paper now in course of preparation, " On the Connexion between the 

 Light Energy (or the Energy of Electric Waves) absorbed by a System 

 and its Chemical, Thermal, Mechanical, and other Energy," the author 

 shows that the fundamental results, which he first elicited here in an 

 experimental way, as well as some other experimental results bearing 

 upon other fundamental issues in other regions of research, can, among 

 other things, be deduced from thermodynamics, and are a necessary 

 consequence of the same. In the same manner the induction and de- 

 duction periods follow as a necessity from the same general thermo- 

 dynamic conceptions. This paper will be communicated in due course 

 in the near future. 



" On a Convenient Terminology for the Various Stages of the 

 Malaria Parasite." By E. Eay Lankester, M.A., F.E.S., 

 Director of the Natural History Department, British 

 Museum. Eeceivecl February 20, — Eeacl March 6, 1902. 



I have found it necessary in labelling a series of models of the 

 malaria parasite in the Central Hall of the Natural History Museum to 

 use as simple and clear a terminology as possible. I think that this 

 terminology will be found useful by others who are perplexed by such 

 terms as " sporozoites," "blasts," "ookinetes," " schizonts," " amphi- 

 onts," and " sporonts " — terms which have their place in schemes deal- 

 ing with the general morphology and life-history of the group Sporozoa, 

 but are not, as experience shows, well suited for immediate use in 

 describing and referring to the stages of the malaria parasite. 



It is necessary to treat the malaria parasite from the point of view 

 of malaria ; that is to say, to consider its significant phases to be 

 those which it passes in the human blood. In reality its mature con- 

 dition and most important motile, as well as its most prolific reproduc- 

 tive, phases are passed in the body of the mosquito. 



1. The malaria-germ which is brought by the stab of the Anopheles 

 into the human blood-vessels is a reproductive particle, a spore. It is 

 neeclle-like in shape, and might be named in reference to its form (e.g., 

 oxyspore or raphicliospore), but the most important fact about it for 

 description and comparison is that it has been formed outside the 

 human body, and is introduced as a strange element into the human 

 blood by the agency of the mosquito. I therefore call it the Exoto 



SPORE. 



2. The Exotospores (probably as many at a time as forty or fifty) 

 enter the blood by the agency of the mosquito's stab and immediately 



