12 Suggestions for the Yunan Expedition. [Jajt. 



2. Small-pox. If present, to what extent prevalent and at what season : 

 If inoculation is resorted to ? 



3. Fevers. Malarial ; typhus ; typhoid ; scarlatina. Treatment adop- 

 ted for Ague. 



4. Goitre. If observed in mountainous districts to what extent pre- 

 valent ; and, if at low elevation, whether the water of the district was hard 

 or soft ? 



5. Dysentery. If of a very fatal character ; and the treatment adopted 

 in the various districts ? 



6. Urinary Calculi. To what extent prevalent and the remedial 

 means adopted. 



7. Syphilis. If of a very virulent kind ; to what extent prevalent ; 

 and, is mercury employed in its treatment ? 



8. Elephantiasis. 



9. Leprosy. 



10. Guinea Worm. 



Any further information that could be obtained concerning the diseases 

 and food-supplies of the people. 



It would also be very desirable that samples of any special remedial 

 agents which are met with should be preserved, when their nature could 

 not be ascertained at the time. 



Photography. 



The most satisfactory dry process Capt. "VVaterhouse has worked is the 

 following. It is simple, and the materials for the preservative are obtainable 

 anywhere. 



I. Preparation of the Plates. 

 The plates must be carefully cleaned and coated on one side only with 

 the following mixture : — 



Albumen, 1 ounce. 



"Water, 40 ounces. 



or one Indian egg to a wine-bottle of water, well shaken, and carefully filter- 

 ed. After being coated with this, the plates are set aside to dry in a place 

 quite free from dust. 



II. Sensitising the Plates. 

 The plates are coated on the albumenised side, in the ordinary way, with 

 a good bromo-iodised Collodion (a mixture of Thomas' and Mawson's bromo- 

 iodised Collodions, with the addition of 2 grains of bromide of cadmium to 

 the ounce, gives good results) and immersed in a 45-grain silver bath for 

 about 5 minutes. After which the plate is soaked in four successive 



