Cash: The Fossil Plants of the Yorkshire Coal Measures, iig 



sending nodules containing- plant structure to 35 Commercial 

 Street, Halifax (of course, in all cases the sender should pay the 

 cost of carriage of the specimens). 



3. At the University of Manchester Museum there are exten- 

 sive collections to which the students may refer, and we doubt 

 not that the courteous Curator will give every facility for study 

 to any serious worker in fossil botany. 



4. In these pages it is hoped descriptions sufficiently clear 

 will be given to enable anyone to name at least most of the 

 genera and the commoner species he may come across. 



5. Collectors of fossil plants with structure will find the 

 specimens offered by Mr. Lomax invaluable. 



Unsolved Problems. — Let none imagine that the field of 

 research is exhausted ; on the contrary, there are a hundred 

 questions yet vmanswered. 



{a) Do nodules containing plants with microstructure occur 

 in any bed besides the Hard Bed ? 



{b) What fossils are restricted to particular beds or zones ? 



(r) To what plants do the many as yet uncorrelated and 

 separate fragments and organs found in the coal measure 

 belong ? 



[d] What new species and genera are yet undescribed ? 



{e) What new points in structure and affinity can yet be 

 cleared up ? 



Notes for Guidance in working out the Vertical and 

 Horizontal distribution of the British Carboniferous 

 Flora. 



I. As soon after collection as possible, label all specimens, 

 stating — 



{a) Full locality, giving name of pit, if collected at a 



colliery. 

 [b) Giving horizon,* where ascertainable. 

 (r) Name of collector. 

 2. — Collect all specimens, however small or uninteresting 

 they may appear, and give great care to the collection of all 

 fructifications — even when fragmentary — whether cones or fruit 

 of ferns. 



3. — On no account varnish the specimens, and if absolutely 

 necessary to apply some preservative medium, use very weak, 



* ' Horizon,' i.e., the name of the coal seam with which the shale was 

 associated that contained the fossil, or any other particulars that will enable 

 the exact position of the rock to be determined from which the fossil has 

 been derived. 



1906 April I. 



