168 



correlation. The ductless glands are principally remarkable 

 for having the machinery for doing a vast amount of work ; 

 yet it has been shown we can get on without them. They 

 are stations less necessary to the vascular system than ganglia 

 are to the nervous system, but more necessa.iy than lymphatic 

 glands are to the absorbent system ; they might to some 

 extent be compared to London fire-engines standing ready 

 for use in case of emergency, only requiring the order to 

 get up steam. I should be curious to know how a patient 

 without a spleen would fare — say in typhus fever. 



I have more than once spoken of machinery, ahvays using 

 the phrase for nuclear matter ; each nucleus would seem to 

 be a battery, the construction of which we have at present 

 no means of finding out. We see hoAV forces can be cor- 

 related with its force, and we are thus able to study its affec- 

 tions ; but we know no more of its construction than of that 

 combination of matter which sustains chemical action, fur- 

 nishing heat and magnetism in the earth's centre. Thermo- 

 electricity and the hypothesis of Grothuss start us with ideas 

 of what goes on during the incubation of an egg, but fall 

 short of furnishing us Avitli a parallel phenomenon. Physi- 

 cists boast of our being able to construct such organic 

 secretions as alcohol, oil, and urea, but this is quite beside 

 the question. The day may come when the chemist in his 

 laboratory may out of stones make bread, but I see no reason 

 to think that he will even in that day do it with other than 

 the comparatively clumsy apparatus with which he has con- 

 structed his alcohol and urea. 



High-Power Definition and its Difficulties a?id the 

 Visibility of Diatomaceous Beading. By G. W. 

 RoYSToN - PiGOTT, M.A., M.D. Cantab., M.R.C P., 

 F.R. A.S., F.C.P.S., formerly Fellow of St. Peter's College, 

 Cambridge. (With PI. X.) 



It is almost superfluous, in the first instance, to advert to 

 the errors so well known to be developed by excessive 

 amplification. 



Indistinctness, haziness, confusion, and blurred outline and 

 commixture of adjacent images, obliterating all that beauty 

 or brilliance which is so charming a reward for carefully 

 conducted observation. 



