118 PROCEEDINGS OF THE SOCIETY. 



In the case of I), cceca, no less than four of Mr. Gosse's species arc 

 melted down as varieties of only one. Mr. Gosse was a very keen 

 observer, and no one could draw better than he did such details as he 

 could see. But obviously, he could not draw what his Microscope could 

 not reveal, and when we know from his son's biography, that Mr. Gosse 

 bought a Microscope in 1850, which, regardless of modern improve- 

 ments, he continued to use throughout his life, we can understand 

 how it is that some of the more minute features in the anatomy of 

 Rotifers escaped his keen scrutiny. 



By the courtesy of Dr. H. M. D. Phillpotts, of Babbacombe, Torquay, 

 its present possessor, and the kindness of Dr. Cressey, who has brought 

 it from Torquay, this Microscope is here to-night for your inspection. 

 You will observe it is an old but first class Microscope, made by Hugb 

 Powell about 1840. It is identical with the old Microscope presented 

 to the Society by Messrs. W. Watson and Sons, in November last year, 

 a description of which, by Mr. Nelson, will be found in the Journal for 

 1901, p. 728. The three object-glasses — 1-in., ^-in., and £-in., all 

 provided with a Lieberkuhn — are exceedingly good even now, and accord- 

 ing to modern standards the two higher powers only lack aperture ; but 

 this want of aperture, or N.A., is precisely what prevented Mr. Gosse 

 from seeing the very minute details, such as the dorsal and lateral 

 antennae in many Rotifers, the fine sette above the toes of the Diaschiza. 

 &c, which are missing in his drawings. A binocular body is also 

 present, and must have been added later in the sixties ; but Dr. Hudson 

 has told me that Mr. Gosse could not use a binocular owing to the 

 shortness of focus of one of his eyes. 



This, then, is the very interesting Microscope with which Mr. Gosse 

 did all his work on the Rotifera, and it certainly is a very efficient 

 instrument, and one of the very best types available at the time when 

 he acquired it, and our very best thanks are due to Dr. Phillpotts for 

 kindly sending this instrument for exhibition, and to Dr. Cressey for 

 bringing it up from Torquay. 



The thanks of the Meeting were voted to Mr. Dixon-Nuttall and 

 Rev. R. Freeman for their paper, to Mr. Rousselet for his remarks, and 

 to Dr. Phillpotts for the loan of this very interesting old Microscope, 

 and to Dr. Cressey for bringing it from Torquay for this Meeting. 



Mr. E. R. Turner made a communication 'On a new Arrangement 

 for taking Photomicrographs in Colours,' and illustrated the subject by 

 the exhibition of a number of examples shown on the screen. 



The problem of photography in natural colours, said Mr. Turner, 

 has been approached from many different standpoints. Very few pro- 

 cesses, however, have been found to be of value. The most successful 

 at present known was suggested by James Clerk Maxwell in a lecture at 

 the Royal Institution in 1861, and although he had not the material to 

 enable him to put his theory into practice, it has been proved since that 

 what he advanced was of real practical value. 



He suggested that the theory of colour-vision might be employed as 

 a means of obtaining a reproduction of the natural colour, and that if 

 the three colours to which the eye was found to be sensitive were repre- 



