362 Sir J. W. Dawson. Additional Report on Erect [Mar. 19. 



Microscopically the changes appear to be mainly of the nature of 

 hypertrophy; the parathyroid of the dog, like that of the rabbit 

 under similar circumstances, does not develop into normal thyroid 

 tissue, no vesicles develop and no colloid forms. 



Another change was noticed in these animals ; in two dogs, in 

 one of which only one lobe of the thyroid had been left, and in 

 the other only one parathyroid, it was seen that the eye on the 

 side on which no thyroid tissue whatever had been left was more 

 widely dilated than the other eye : this result cannot be explained by 

 injury to the sympathetic, but the experiment requires repetition ; 

 it is, however, in accord with some experiments in rabbits in which 

 the parathyroids had been excised ; it was noticed that in some of 

 these rabbits the eyes had become more prominent, judging that is 

 by comparison with controls especially selected for each rabbit on 

 account of equal prominence of eyes. 



XII. " Additional .Report on Erect Trees containing Animal 

 Remains in the Coal Formation of Nova Scotia." By Sir 

 J. William Dawson, F.R.S. Received March 19, 1896. 



In April, 1892, I communicated to this Society a report supple- 

 mentary to my paper of 1882 on the above subject.* This was 

 published in the ' Proceedings ' of the Society, Vol. 52. In this report 

 reference was made to the work done by Dr. Scudder. of Cambridge, 

 U.S., on the Myriapods and Arachnids of the reptiliferous trees. Dr. 

 Scudder's results have now been published with two illustrative 

 plates in the ; Contributions to Canadian Palaeontology of the Geo- 

 logical Survey of Canada,' Vol. 2, Part I, 1895. In this paper Dr. 

 Seudder describes three additional Myriapods and three Scorpions, 

 making in all eight species of Millipedes and three of Scorpions 

 which the' erect trees of the South Joggins have added to the fauna 

 of the Carboniferous Period. 



In the spring of 1893 I was informed by Mr. P. W. McNaughton 

 of the South Joggins, who had kindly undertaken to examine the 

 cliff for me, that he had observed in two distinct beds considerably 

 below that which had afforded the twenty-four erect trunks taken 

 out of the cliff and reef at Coal-mine Point and reported on in 1882, 

 erect stumps which he believed to contain animal remains. As I 

 was at the time incapacitated for field work by the effects of a serious 

 illness, I made arrangements, with the aid of Mr. McNaughton, to 

 have the two trees in sight removed from the cliff and boxed up in 

 as large pieces as possible and forwarded to me in Montreal. 



* ' Phil. Trans.,' Part II, 1882, p. 621. 



