108 Transactions of the Society. 



bodies as well as with the host tissue. But smears seem to intro- 

 duce new conditions. As a general rule, however, grains which 

 appear in ordinary smears will not be found to be either mitochon- 

 dria or Golgi rods. With regard to the " chromidia," Hirschler 

 (Anat. Anz., XLVII.) remarks : " Die ' Chromidienschollen,' die 

 fast ingesamt mit den Mitochondrion identisch sind, wiirden 

 vielleicht in einem geringen Teile auch den (Golgi) Apparatele- 

 menten entsprechen." This remark, which refers to Protista, will, 

 I believe, apply to many cases of so-called " chromidia," which are 

 often only badly-preserved mitochondria. In many other cases 

 however they do seem to be of true nuclear origin and of chromatinic 

 nature. Nevertheless protozoologists will in the future need to be 

 careful in their use of this term, and in the proper identification of 

 bodies found in many protozoan cells. In the latter one constantly 

 finds isolated granules, or a few granules near or associated with 

 flagellas or other motile organs. These seem to be distinct from 

 either Golgi apparatus or mitochondria. 



Finally, it may be remarked that the above Tables may not 

 apply in every special case. It is naturally quite impossible to 

 draw up a set of tables not liable to exceptions ; but I have little 

 doubt that with the invention of newer methods and modification 

 of existing ones, it will eventually become possible to draw up 

 tables which will be liable to very few exceptions. The Analytical 

 Tables given on page 105 are an example of the possibilities of 

 present-day cytology. While such a substance as yolk varies very 

 disconcertingly in its fixing and staining affinities, so much so as 

 to produce confusion, we have such encouraging evidence as the 

 fact that the Golgi apparatus of Monocystis ascidiie shows the same 

 chemical characteristics as that of a mammalian germ cell, and so 

 on. There are many other similar facts, which lead us to believe 

 that the cells of all living animals and plants are fundamentally 

 built on the same general plan, and will be found to contain bodies 

 whose chemical reactions fall under the same heads; wherefore, 

 allowing for special peculiarities, it should be possible eventually 

 to classify cell organs almost as definitely as we have been able to 

 classify chemical substances. It must be mentioned that the fact 

 that all metazoan cells are organized in .the same fundamental 

 manner is very remarkable, and is one of the most important 

 results of the latest work on the elements in the cytoplasm. 



Morphological Distinctions. 

 Figs, 1-3. 



Apart from the histo-chemical tables given, one has certain 

 evidence which can be deduced by the examination of the shape of 

 the body under observation. (See figs. 2 and 3, A, B, C, D, E, F, 

 G and H.) 



