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common by two scholars separated one from the other by several hundred 
kilometers, was made known, an illustrious-fellow scholar could not refrain 
from showing his surprise and expressing his doubts as to the success of 
such an association. Now, contrary to these pessimistic forebodings, the 
association, “ Renauld and Cardot,” formed for scientific purposes, has 
produced a considerable number of species, of good species which will leave 
to the sieve of criticism but an unimportant waste, much smaller than may 
be found in the work of other bryologists of repute. 
It is right to say that in associating himsejf with J. Cardot, Renauld did 
a happy thing, and that the pupil whom he trained, has become one of the 
uncontested masters of the science of Bryology. 
Renauld and Cardot have added to the knowledge of North American 
flora a quanity of new information. They have signed some important 
works on the flora of Costa-Rica, of the Congo, of the Canary Islands, with- 
out mentioning the valuable documents contained in the “ Musci exotici 
novi,” published 1890-1903 (ten fascicles), which relate to the entire flora of 
the globe. Seven genera and more than 400 species bear the signature: 
Ren. et Card. this large number is the best proof of the excellence of 
this co-operation. 
Those who seek the personal touch of the scientific spirit of F. Renauld 
will find it in the “Prodrome de la Flore Bryologique de Madagascar des 
Mascareignes et des Comores” (1897), followed by a supplement which 
appeared in 1909, and in his “ Essai sur les Leucoloma.” The fii'st is a work 
of the greatest importance on the flora of the South African islands. There 
already existed a short account of this flora that Bescherelle had published 
in 1880 under the title, “Flore bryologique de la Reunion,” but the docu- 
ments and the materials which Renauld was able to procure enabled him to 
compose a monumental work on the bryological flora of this region. 
This work is a work of indisputable scientific value that bryologists will 
always consult with profit and interest. 
The work on the “ Leucoloma ” that our friend, too modestly, entitled, 
“Essai,” reveals to us his method of work, the loftiness of design and his 
enlightened conception of natural facts. The genus, Leucoloma, which had 
hitherto only been a desultory grouping of a small number of species has 
become, thanks to his thoughtful researches and sure judgment, a natural 
group in which the bryologist moves freely, easily finding his way in spite 
of the extension Renauld was able to give it. If his “Essai” could not for 
want of material and time, develop into a complete account, he has at least 
greatly facilitated the future preparation of this complete account, and 
moreover, I am sure that bryologists will often consult this essay for the 
wisdom that Renauld’s long experience has introduced into it and the scien- 
tific method which inspired him. Here it seems to me well to mention that 
the publication of these works of Renauld: “Prodrome:” “Supplement;’’ 
“ Essai sur les Leucoloma,” has been assured by the great generosity of Son 
Altesse Serenissime, le Prince de Monaco. 
Ferdinand Renauld completed his bryological studies with some valuable 
