314 DR. J. D. HOOKER'S PRESIDENTIAL ADDRESS 
with loosely-attached cellular bodies. Any one of these bodies, if placed under 
eae - will produce a perfect plant, similar to its oes arent. You 
leaves and €— of €— bodies, PRES with the same pae of be- + 
on their affinity for other aea developed cells in due order of succession. 
Gemmules which do not become developed may, according to his hypothesis, 
of — will apriori ro itself to some minds, and not to others. To so 
the y minute circulating gemmules will be as apparent to tis 
mind’ eye as the stars of which the milky way is Sapa others will prefer 
embodying the idea in such a term as potentiality, a term which conveys no 
— impression whatever, and they will like it none the less on this ac- 
coun 
* Whatever be the scientific value of these gemmules, there is no question 
but that to Mr. Darwin’s enunciation of the doctrine of Pangenesis we owe it 
at we have ‘the clearest and most systematic cen of the many woe: 
henomena t has et appear ed ; and agains 
ie guarded entertainment. of the hypothesis, or eddie if you a 
means of correlating these phenomena, nothing can be urged in the present 
state of science. The President of the Linnean Society, a proverbially cautious 
naturalist, ee em | expresses his own ideas of Pangenesis :—' If (he says) we 
take into c how familiar mathematical signs and symbols make us 
with numbers and combinations, the actual realization of wen is beyond al 
human capacity, how inconceivably minute must be thos —Ó which 
most powerfully affect our sense of smell and our üben ; and if, dis- 
carding all previous notions, we follow Mr. Darwin step by step in pet mg 
