275 
Pacific. These are estimated to contain of trees properly so called 
and extra-tropical— 
Atlantic American, - non-coniferous, 55 genera, 130 species. 
conifers, Pio 2 . 
: 66° “ 155 oe 
Pacific American, - non-coniferous, 19 es 34 species. 
conifers, 12 . 44 species, 
31 “a 78 “ 
Japan-Manchurian, -  non-coniferous, 47 genera, 123 species. 
coniferous, 19 . abo 
66 a 168 
European, _ non-coniferous, 26 genera, 68 species. 
coniferous (ees ve tee 
? 
3% “ 85 = 
If we compare the respective totals of these tables, we notice a pretty 
close correspondence between the eastern sides of the continents in 
excess and between the western sides in deficiency, which would lead 
us to suppose that some common cause had been at work, especially 
when Dr. Gray points out that many of the same missing trees of the 
great northern forests are found fossil in Europe and Pacific America, 
But this correspondence is thuch impaired when we consider separ- 
ately the non-coniferous and coniferous trees of the two western 
sides of the continents. Dr. Gray admits the difficulty of explain- 
ing our Pacific forest completely, but the lecture is full of instruc- 
tion on its peculiarities, on the influence of rain on forest distribu-- 
tion, and on many other points. In reference to his remark that 
probably “the line of demarkation between our woods and plains 
is not where it was drawn by nature,’”’ Prof. C. A. White, in a note 
to the October No., states that: “ The forest area of Iowa is rapidly 
increasing to-day, both by natural growth and artificial propaga- 
tion.” In the November No. Prof. Farlow has a note on Prof. de 
Bary’s prosecution of observations on the asexual production of 
Pteris Cretica, first noticed by Dr. Farlow. It seems that not only 
other ferns, Aspidium Filix-mas for example, have this peculiarity, but 
also other plants. Of Chara crinita the female is alone known in 
Northern Europe, yet it fruits abundantly. Something similar takes 
place even in higher plants.—5. Zhe American Quarterly Micro- 
scopic Journal, Vol.1, No. 1., Oct. 1878, Published by Hitchcock and 
Wall, 150, Nassau, New York, $3 per annum. We hail this new 
publication as a sign of increased attention to the microscope, on 
which the future of botany so largely depends.—6. The Forests of 
Alabama and their Products, and The Grasses and other forage 
plants of Alabama, by Chas. Mohr, Mobile. The list of trees and 
‘shrubs numbers 221. An introduction describes the geological for- 
mations where they are found, and the wonderful increase in the lum- 
ber activity of Alabama. 137 grasses are enumerated. Among the 
forage plants we are surprised to see Desmodium acuminatum and 
