REVIEWS. 251 
being coloured the darkest shade of brown, those that yield between 16 
and 20 a lighter shade, and so on down to those that yield less than five. 
The following list by itself will show pretty well what is the geographical 
range of the genus. 
Species. Species. 
Alps from France to Croatia . 42 Scandinavia . R3 2 | | 
Himalayas and Tibet . . . 35 
"wb wi poc A 
Pyrenees... ere: 30 France exclusive of Pyrenees. 13 
Carpathians . . . . . . 25 MidSpan . ....., 12 
Rocky Mountains . . . . 22 Britam s . . + +s -s 12 
Apennines RI C oe 19 Altai . ll 
East Siberia. . . 16  Sudetes 9 
Central Siberia . . : Sere MES buius 
Mountains of South Spin . 16 Url . . . . es.. 8 
Roumeliaand Greece . . . 14 Andes. b 5 
Of course in the wide field of detail which such a book covers, there is 
plenty of room for differences of opinion and for criticism. We think it 
n the clavis of genera at page 5 Dr. Engler differentiates the two as 
llows :— 
Ovarium basi tantum tubi calycini adnatum flores protogyni. — — 
genia. 
Ovarium cum tubo calycino plus minus connatum flores protandri. 
Sazifraga. 
is is incorrect, for a considerable proportion of Saxifraga has 
the ovary entirely free, and is contradicted by the author himself in his 
detailed character of the genus at page 72, “ Carpidia 2, rarius 3-5, plus 
minusve in ovarium liberum vel calycis tubo adnatum concreta.” In 
planning out his sections, he relies primarily on the shape of the seed. 
This is ani tion which we cannot but look uj the very reverse of an 
improvement ; ovary-adhesion, the presence or absence of large pores at 
the edge of the leaf, and general habit are all more important and more 
readily appreciable characters. Bobertsonia, placed amongst the Hfoveo- 
late, has large pores along the edge of the leaf, one in each of the teeth, 
though not chalk-secreting, as in Aizoon and its allies. In some eases Dr. 
M 
di tastanid by Haworth in 1821, and adopted by J ordan and Fourreau 
as a genus, he uses the name Euaizoonia, adopted from Schott's Analecta. 
We are quite sure that no one in England will agree with his disposition 
of our Dactyloid forms. He does not appear to have seen Haworth’s 
