. The microscope and its revelations. optical productions ofAbbe are too well known and too valuable as a rule to make itneedful to be other than perfectly frank concerning so important apiece of apparatus as this ; and there can be no doubt that the widepopularity of this instrument is due, not so much to intrinsic meritas to the fad that it has been employed much by those who,previously ignorant of the value of ,m,/ condenser, have at onceperceived 1 he eiillaiiced value of the results yielded by its means. To those who have made the scientific use of the microscope acareful study in England
. The microscope and its revelations. optical productions ofAbbe are too well known and too valuable as a rule to make itneedful to be other than perfectly frank concerning so important apiece of apparatus as this ; and there can be no doubt that the widepopularity of this instrument is due, not so much to intrinsic meritas to the fad that it has been employed much by those who,previously ignorant of the value of ,m,/ condenser, have at onceperceived 1 he eiillaiiced value of the results yielded by its means. To those who have made the scientific use of the microscope acareful study in England it has been a persistent source of regretthat it was so long ami pertinaciously taught thai the correcthistological microscope musl be of the llartnack type, and that itshould lie used uith narrou angled dry lenses, perhaps a -ith-inchfocus, and no illumination but that afforded by a small concaveminor, the focal point of which is extremely doubtful or unknown, I and the Condenser. E. M. /.//</. , IMPORTANCE OF APLANATIC CONDENSE!! 309 and in practice wholly disregarded. Ko doubt a student instructedon these lines would be astonished indeed when he exchanged such apractice for the illumination and improved image afforded by ;uiAbbe condenser. Usually such exchange of illuminating method presages an ex-change of instrument, for the scientifically imperfect and whollyunsatisfactory toolthat is in the majority of cases put into thehands of the medical student will not lend itself even to an Abbecondenser. The fact is that a large part of the admiration that has been ex-pressed for this condenser has resulted, not from a comparison of itsresults with those of oilier high-classachromatic condensers, but of imagesobtained without any sub-stage opticalarrangements at all, placed in contrastwith the results obtained by using thiscondenser against the same objectivewhen used without its aid. But thateven these images are entirely inferiorto the imag
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
