XXX 
FIFTH REPORT 
1835 . 
rare or very local , and of those which thrive, or which have be¬ 
come, or are becoming extinct; with such remarks as may be 
useful towards determining the connexion which there may be 
between the habitats of particular plants, and the nature of the 
soil and the strata upon which they grow; with statements of 
the mean winter and summer temperature of the air and the 
water, at the highest as w T eli as the lowest elevation at which 
species occur; the hygrometrical condition of the air, and any 
other information of an historical, (Economical, and philosophi¬ 
cal nature. 
6. That Professor Dauben}^ be requested to institute an ex¬ 
tended inquiry into the exact nature of the secretions by the 
roots of the principal cultivated plants and weeds of agriculture ; 
and that the attention of botanists and chemists be invited to the 
degree in which such secretions are poisonous to the plants that 
yield them, or to others; and to the most ready method of de¬ 
composing these secretions by manures or other means. 
7. That Mr. Mackay be requested to institute a series of ex¬ 
periments to determine the limits of species in the genus Saxi- 
fraga , and especially of those which are natives of Ireland* 
Likewise, that he be requested to communicate a detail of the 
peculiarities of the vegetation of the east and west coasts of 
Scotland and of the opposite coast of Ireland. 
8. That a Committee be formed to conduct a series of experi¬ 
ments on the growth of plants from seeds, and to preserve the 
results of their experiments, in order to establish the identity or 
confirm the specific distinctions of certain allied plants, and to 
communicate the results obtained from year to year at the Meet¬ 
ings of the Association*. 
Desiderata noticed in Mr. Jenyns's Report on Zoology . 
1. Local Faunas, in which the structure and habits of animals, 
although only of a few species, shall be given with scrupulous 
accuracy—monographs in which species shall be investigated 
with a view to their exact differences, and in which the syno¬ 
nyms of those which have been noticed by other authors shall 
be distinctly made out. 
2. Further attention to the Fishes and Invertebrata of the 
British coasts, and especially to the Radiata of Cuvier. ( Reports , 
vol. iii. p. 249 .) 
* Mi*. Don, Librarian to the Linnsean Society, has undertaken to he the 
channel of correspondence on this subject. 
