But the author admits that in the case of graptolites with two 

 ranges of thecse the classification *" although in my opinion the 

 best possible in the actual state of our knowledge, is to be regarded 

 as confessedly temporary and provisional." *" All that is attempted 

 in this department is roughly to prepare the way for the next and 

 future advance in the proper classification of these species." 

 Nevertheless he added certain forecasts as to the probable 

 trend of future research which have been verified in the sequel. 



2. Graptolite Papers. 



This was followed by a long series of papers, each one of them 

 adding something new : ' Note on the Graptolites discovered by 

 Mr. John Henderson in the Silurian Shales of Habbie's Howe, 

 Pentland Hills,' 1874 ; ' On the Diprionidse of the Moffat Series,' 

 1874 ; ' Descriptions of the Graptolites of the Arenig and Llandeilo 

 Rocks of St. Davids ' 1875, with John Hopkinson ; ' On the 

 Scottish Monograptidae/ 1876 ; ' Silurian Rocks of the West of 

 Scotland ' (with figures of the Graptolites), 1876 ; ' On the Grapto- 

 lites of County Down,' 1877 ; ' On the Genus Nemagraptus of 

 Emmons/ 1880 ; ' On New British Graptolites/ 1880 ; ' On the 

 Cladophora or Dendroid Graptolites collected by Professor Keeping 

 in the Llandovery Rocks of Mid- Wales/ 1880 ; ' On Graptolites/ 

 1882 ; ' Preliminary Report on some Graptolites from the Lower 

 Palaeozoic Rocks on the South Side of the St. Lawrence from Cape 

 Rosier to Tartigo River/ etc., 1886 ; ' Notes on Graptolites from 

 Dease River, B.C./ 1889 > an d, his last paper, never published in 

 full, ' Balston Expedition to Peru : Report on Graptolites collected 

 by Captain J. A. Douglas/ 1917. 



This list of fifteen papers is not only a testimony to his own 

 industrious collecting and investigation, but it shows quite 

 inadequately, however something of the help he rendered to his 

 fellow-workers. In many of these cases, and in an abundance of 

 others not separately notified except by acknowledgment in the 

 text of papers by other writers, we learn how much confidence was 

 reposed in his knowledge, judgment, and good nature. He spent 

 much time in determining the forms submitted to him, often 

 describing them if they were new or uncommon, or species 

 important for working out the horizon they indicated, or for showing 

 where further local research was necessary. It is true that on 

 more than one occasion he put a certain strain upon this confidence 

 when he felt bound to assert that the graptolites did not confirm 

 the conclusions to which the field work pointed ; but in each case 

 in which he did this, later research has proved that he and the 

 graptolites were right and the local observer wrong. 



* 6, p. 556. 



