Q8 DR. GUY ON THE ILLUMINATOR HAND MICROSCOPE. 



susceptible. Nor will I take up the time of the Society by des- 

 cribing the successive steps by which my employment of a disk of 

 glass for receiving metallic sublimates (the most important advance, 

 as it has proved to be, in the modern science of micro-chemistry), led 

 me first to the use of a Codrington lens, then of the compound 

 microscope, as a class-instrument, admitting of being passed from 

 hand to hand, without displacement or disturbance of the object 

 exhibited. 



Suffice it to say that I am now in a position to state, as the 

 result of some experience among groups of persons in society, and 

 in school-rooms, no less than in the hands of individuals working 

 in the closet or in the field, that we have in the Illuminator Hand 

 Microscope a most simple, facile and effective instrument of enter- 

 tainment, instruction and research. 



Recent Observations on Diatomace^. 



In the ** Lens," a quarterly Journal of Microscopy published at 

 Chicago, U.S.A., are three consecutive papers entitled " Conspectus 

 of the Families and Genera of the Diatomaceae," by Professor H. 

 L. Smith, which are worthy of attention. A short critical notice of 

 this conspectus, by Mr. F. Kitton, appears in " Grevillea" No. 4. 

 In the first number of the " Lens," Mr. S. A. Briggs communi- 

 cates a list of the Diatomaceae of Lake Michigan. 



It has been regretted by many workers in Diatomaceae, with 

 limited means, that the valuable memoirs published from time to 

 time by Herr Grunow, in the transactions of foreign societies, are 

 beyond their reach. To meet this difficulty, the Editor of " Grevillea " 

 has commenced the publication of fac simile figures, with transla- 

 tions of the descriptions in that Journal. The first plate of the 

 Novara Diatoms has appeared, and the remaining two are printed 

 ready to follow. It is proposed hereafter to publish figures and 

 descriptions of the species in the Vienna Transactions. Additional 

 critical observations will be made, as occasion may requii-e, by Mr. 

 F. Kitton, the translator of the descriptions. 



