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XXV.—On Sun Pictures, by the Calotype Process. By 
Doveras T. Krrpurn, Esa. [ead 4th December, 
1858.] 
THE publications on the principles and practice of Pho- 
tography are already numerous, and many of them are 
written with perspicuity and method, so as to form excellent 
Vade-mecums for the student, whether he may haye pro- 
secuted the art for professional gain, or yielded to its 
delightful and seducing influence as an amateur. My 
present purpose is not, therefore, to give a history of Photo- 
graphy, or such an elaborate description of its principles 
as would involve a consideration of the theory of light and 
of the laws of optics and of practical chemistry, but only 
to make public, through the means of the Society, the pro- 
cess which I haye myself employed in the production of a 
few calotype views of Hobart Town, &c., submitted for 
inspection at a late meeting of the Society. An enthusiast 
myself in the pursuit of Photography, I am anxiously desir- 
ous of leading others into the same delightful path; but I 
am yet only a beginner, and venture with great diffidence to 
proceed. 
Under the general name of Photography are comprised 
various subdivisions and modifications of the art; such as 
Taguerreotype, Calotype, Anthotype, Cyanotype, Ferreo- 
type, &e. Of these, the three following have been success- 
fully prosecuted: the Daguerreotype, discovered in 1889 by 
M. Daguerre, a Frenchman,—the process now so universally 
employed for taking likenesses on metal plates; the Calo- 
type, or Talbotype, from Mr. Fox Talbot, by whom it 
was discoyered in the same year,—the process upon paper 
