MAtIPAS*S RESEARCHES ON CILIATE INFUSORIANS. 599 



Abstract of Maupas's Researches on Multipli- 

 cation and Fertilisation in Ciliate Infusorians. 



By 



IHarcus 91. Hartog, D.Sc, M.A., F.Ii.S., 

 Professor of Natural History at Queen's College, Cork. 



The interest so widely felt in all questions of heredity and 

 reproduction removes all need for excuse in presenting an 

 abstract of two of the most important contributions to this 

 question. 1 I drew this up originally for my own guidance,^ 

 and have now enlarged it with a few modifications in what I 

 may term " notation," to make the nuclear relations more 

 easy to master. 



The methods used are given at length. Cultures are made 

 from single progenitors in a drop of water placed on a slide 

 and covered, with bristles, &c., placed under the thin glass to 

 prevent pressure, the total amount of water being about 

 10 cgms. These slides are kept in moist chambers, and the 

 slight loss of water from evaporation is made up as needed with 

 distilled water. The Infusoria under these circumstances live 

 and thrive, assembling in a circle just within the cover, and 

 not moving about much when well supplied with food, so that 

 counting them is no difl&cult task. The Ciliata may be divided 

 into herbivorous and carnivorous. The former are fed by 



1 " Sur la multiplication des Infusoires Cilies," in ' Archives de Zoologie 

 Experimentale,' ser. 2, vol. vi, pp. 165 — 273, t. ix — xii ; "Le Rajeunisse- 

 ment Karyogamique chez les Cilies," op. cit., vol. vii, pp. 149 — 517, 

 t. ix— xxiii. 



2 In the autumn of 1889 ; the abstract in its present form was completed 

 in November, 1890. 



