x 
those which grow in the State. The Phanerogams and Acrogens 
are pretty nearly full, the Anophytes less so, but no department of 
the Thallogens, except the Marine Alge, is probably represented 
in this list by one-half of those species which belong there ; 
indeed, the enumeration was so evidently incomplete, that at first 
it was intended to omit the entire class, except the Marine Alge, 
and it is now inserted with this explanation, and the hope that 
microscopists may be induced to search out and add the missing 
species to those herein named. 
It may well be said in this connection, that questions of great- 
est interest, not alone in a merely technical sense, await solution, 
which may fairly be expected from the study of the life history 
of the microscopic Alge@ and allies: that algoid and fungoid vege- 
tation has much to do with disease in man and beast and higher 
vegetable organisms, is held as proven; but whether as cause or 
effect, or only coincident, is not entirely agreed. No greater ques- 
tions of material value await determination, than the relations 
between decay of physical life and the growth of microscopic veg- 
etation. It may be perhaps that the study of these relations, by 
some of our younger botanists shall lead to an elucidation of facts 
and a determination of truths of unmeasured value to the com- 
monwealth. 
That family of plants, Protophyta, containing those species 
always present in ferments, comprising Saccharomyces, Bacillus, 
Bacterium, &c., is not here noted; a lack which some future 
student must supply. 
All that is claimed for this enumeration is its purpose to help 
and encourage the beginner; —at the same time it gives, we 
believe, correct information to the advanced botanist of facts 
regarding habitats and distribution of species. Claim to absolute 
accuracy of determination, in every case, is not made, and it is 
frankly admitted that corrections, as well as reformations, perhaps 
