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Sir : The Reformation , like any religious change , is very difficult to assess accurately from archaeology ( ` Resisting the Reformation in secret , ' March ) . Goals such as " we will restore the genetic composition of the system to predisturbance conditions , " although theoretically achievable , would be very difficult to evaluate because of the data-intensive requirements of genetic research relative to the level of the ecosystem and because of the lack of predisturbance genetic data . I find it difficult to talk about tone , but perhaps it 's enough to compare Lowell 's poem with Emile Zola 's " J'accuse " or ( a poem from the same year as " The Sisters " ) Claude McKay 's " Mulatto . We have recognized in our past decisions that when afacility was not established as a facility specializing in care andtreatment of persons with mental diseases , but begins taking on more andmore patients with mental diseases , it is difficult to draw the line indetermining at what point the facility would attain the overallcharacter of an IMD so clearly that the state should have known that FFPwould not be available for the services provided at the facility . " It can be very difficult to convince employees that they should respond to a spill on Friday at quitting time .