94 
The Presidenfs Address. 
of apparatus for microscopic investigation ; and should he 
continue to apply himself to this department of study^ there 
can be no doubt that the microscopic inquirer will be 
indebted to him for further improvements in the mechanical 
arrangements of the microscope. 
But the labours of our Society do not end here. You must 
not forget that the ' JournaF originated in your Society^ and 
has been conducted under its auspices^ and that the papers 
published in its pages are as much a part of your organization 
as the papers published in your ' Transactions.^ For the 
very reason that the papers in your ^ Transactions ^ have been 
less in number^ those in the ' J ournal ' have been more^ and 
in no year since its origin has the ^ Journal ^ been more rich 
in original papers than during the past year. These papers 
have been eighteen in number, besides translations and a 
variety of communications in the form of notes and memo- 
randa. No less than ten of these have been on the Diato- 
macese ; and although some may regard this as a dispropor- 
tionate space for one set of objects to occupy, it must be 
remembered that these organisms are exclusively microscopi- 
cal, and that at the present moment they possess for the 
microscopist a high interest, for reasons which I have before 
stated. 
Two of the remaining papers, by Mr. Rainey, deserve your 
especial attention ; one On Dental Tissue,^^ the other " On 
the Starch Granule.^^ The object of Mr. Eainey in these 
papers is to show that the formation of the dental tissues, as 
well as of the starch granule, are due to the same process as 
that which he has so ably shown to take place in the produc- 
tion of shell and other hard parts, in his work on ^ The Mode 
of Formation of Shells of Animals,^ &c. As long ago as 1840 
and 1841, Harting and Link published separate treatises^ 
on the Production of Membranes, as the result of a process of 
crystallization of inorganic substances in contact with organic 
matters ; and from time to time the presence of the aggre- 
gating force of crystallization has been alluded to, as possibly 
modifying the results of that action which has been called 
cell-force. It is, however, to Mr. Rainey that we are indebted 
for a full investigation of this subject ; and he has shown that 
in all cases where a considerable quantity of inorganic matter 
is present, as in the case of carbonate of lime in shells, and 
phosphate of lime in bones and teeth, that the peculiar form 
of the tissue is due to the properties of the inorganic matter 
present. In his paper On the Starch Granule,^^ he has car- 
* See Report on Botany, of Ray Society, 1845, pp. 6, 7. 
