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cambio from the Latin to exchange. This change take place wiien its 

 residence may then come to an end and the amoeboid form, which is 

 then an Amoeba, may end then and there. The carbon and oxygen 

 componnd is dissipated and change to carbon and oxvgen. Of coursc 

 we cannot see it but \vc know that it must be so. And \ve want 

 to asccrtain for it is interesting to know, in fact it is necessary also 

 to know, is this compound of Cx and Ox, a « chemical compound » 

 or is it a « vita! compound » ? 1 am disposed to think it a a vital 

 compound ». And what is a « vital compound » at ali .^ Do they 

 exist .^ I am doubtfuU if they exist at any rate. As O, oxygen, che- 

 mical oyygen when taken into the animai body escapes as CO,. 

 Carbon di-oxide, « vital carbon di-oxide » and can we distinguish 

 a chemical action « from « vital action .^ 1 do not sce how we can. 

 This change of residence has been called in the larger forms of 

 exiteence » diffusion of species « or one of the forms of » diffusion 

 of species. And perhaps it is so. 



The amoeboid form makes itself apparent in the form of an 

 Amoeba which is commonly free in the moisture of the water. But 

 when the water coniains stones or particles of day or peat or por- 

 tions of living or dead vegetable animals, in fact anything for the 

 amoeboid matter to run against it stops then and there and deve- 

 lops into something else. 



This it does by cambio. Then, by cambio, it changes into a 

 Bacillarian for I bave see this take place several times. I suppose this 

 has not been seen and recorded by those who work af objects of na- 

 turai history first by the rarity of useing the microscope. I do not 

 say posessing a microscope. For many of those posses a microscopc 

 but few can use it. And 1 known that many observers of naturai 

 history do not even possess a microscope. Think of a chemist wi- 

 thout a test tube! A naturalist without a microscope isjust as help- 

 Icss. Then, by cambio, it change into a Bacillarian and in this 

 manner Bacillaria appear. And 1 know many may name the Diatoms 

 but very few study the Bacillaria. For very few do work at them lor 

 hours together. 1 have often put a slide of Bacillaria on the micro- 

 scope and veiwed it several hours, in fact from two or three oclock 

 in the day time until next morning when 1 went to breakfast. In this 

 way I have seen the changes which 1 now record. There is a Bacil- 



